404 ON THE GEOLOGY OF YASS PLAINS, ( THIRD PAPER.) 



Large specimens of this species, having the carapace as much 

 as an inch and a half in length, are to be found at low-water on 

 sandy flats on the shores of Port Denison. 



4. Myra australis, Haswell. 

 Myra australis, Has welly I. c, p. 50, pi. 5, fig. 3. 

 Common at depths of a few fathoms in Port Denison. 



5. Phlyxia lambriformis, Bell. 

 Phlyxia lambriformis, Bell, I. c, p. 309, pi. 34, fig. 1. 

 Dredged in 20 fathoms, off Holborn Island, Queensland. 



6. Nursia gracilis, Bell. 

 Dredged in 9 fathoms, Port Denison. 



7. NURSILIA DENTATA, Bell. 



Nursilia clentata, Ball, I. c, p. 309, pi. 34, fig. 6. 

 Dredged in 9 fathoms, Port Denison. 



8. Oreophortjs nodosus, A. Milne-Edwards. 



Oreophorus nodosus, A. Milne-Eduards, Anmles de la Soc, Ent. 

 de France. 



Found under a cluster of madrepora, Stone Island; also 

 dredged in about 9 fathoms, Port Denison. 



On the Geology of Yass Plains, (3rd paper.) 



By C. Jenkins, Esqr., L.S. 



It was suggested to me late yesterday that as at this meeting 

 there would probably be present an unusual number of Geologists, 

 it would be a suitable time to address to you a few remarks on the 

 subject of the Silurian beds in the neighbourhood of Yass. 



